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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-09-19 19:34:26 +0400
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-09-19 22:07:58 +0400
commit2ef13294d29bcfb306e0d360f1b97f37b647b0c0 (patch)
tree877e1ece00c14de0f0d79e86b6480d284d309216 /fs/ubifs/misc.h
parent2680d722bf2c5f75225dd9acb3ec9e5a9e2652f4 (diff)
downloadlinux-2ef13294d29bcfb306e0d360f1b97f37b647b0c0.tar.xz
UBIFS: introduce new flags for RO mounts
Commit 2fde99cb55fb9d9b88180512a5e8a5d939d27fec "UBIFS: mark VFS SB RO too" introduced regression. This commit made UBIFS set the 'MS_RDONLY' flag in the VFS superblock when it switches to R/O mode due to an error. This was done to make VFS show the R/O UBIFS flag in /proc/mounts. However, several places in UBIFS relied on the 'MS_RDONLY' flag and assume this flag can only change when we re-mount. For example, 'ubifs_put_super()'. This patch introduces new UBIFS flag - 'c->ro_mount' which changes only when we re-mount, and preserves the way UBIFS was originally mounted (R/W or R/O). This allows us to de-initialize UBIFS cleanly in 'ubifs_put_super()'. This patch also changes all 'ubifs_assert(!c->ro_media)' assertions to 'ubifs_assert(!c->ro_media && !c->ro_mount)', because we never should write anything if the FS was mounter R/O. All the places where we test for 'MS_RDONLY' flag in the VFS SB were changed and now we test the 'c->ro_mount' flag instead, because it preserves the original UBIFS mount type, unlike the 'MS_RDONLY' flag. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'fs/ubifs/misc.h')
-rw-r--r--fs/ubifs/misc.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/ubifs/misc.h b/fs/ubifs/misc.h
index 5d476ba184e6..c3de04dc952a 100644
--- a/fs/ubifs/misc.h
+++ b/fs/ubifs/misc.h
@@ -132,7 +132,7 @@ static inline int ubifs_leb_unmap(const struct ubifs_info *c, int lnum)
{
int err;
- ubifs_assert(!c->ro_media);
+ ubifs_assert(!c->ro_media && !c->ro_mount);
if (c->ro_error)
return -EROFS;
err = ubi_leb_unmap(c->ubi, lnum);
@@ -160,7 +160,7 @@ static inline int ubifs_leb_write(const struct ubifs_info *c, int lnum,
{
int err;
- ubifs_assert(!c->ro_media);
+ ubifs_assert(!c->ro_media && !c->ro_mount);
if (c->ro_error)
return -EROFS;
err = ubi_leb_write(c->ubi, lnum, buf, offs, len, dtype);
@@ -188,7 +188,7 @@ static inline int ubifs_leb_change(const struct ubifs_info *c, int lnum,
{
int err;
- ubifs_assert(!c->ro_media);
+ ubifs_assert(!c->ro_media && !c->ro_mount);
if (c->ro_error)
return -EROFS;
err = ubi_leb_change(c->ubi, lnum, buf, len, dtype);